Removed the custom_undo_redo setting since it doesn't make sense to disable it.
Removed the custom_undo_redo setting since it doesn't make sense to disable it.

nikolas/tinymce,FernCreek/tinymce,M4R7iNP/tinymce,widgetfactory/tinymce,mplank/tinymce,FernCreek/tinymce,enfold/tinymce,VioletLife/tinymce,rxl194/tinymce,cclaerhout/tinymce,danchr/tinymce,ikuchmin/tinymce,nikolas/tinymce,1099511627776/tinymce,nbcp/tinymce,TeamupCom/tinymce,mplank/tinymce,toxalot/tinymce,danchr/tinymce,Razzwan/tinymce,1099511627776/tinymce,rxl194/tinymce,Razzwan/tinymce,endjin/tinymce,MediehusetTek/tinymce,kencheung/tinymce,Shopify/tinymce,endjin/tinymce,dziemian007/tinymce,support-dot-com/tinymce,bsuh/tinymce,TeamupCom/tinymce,collective/tinymce,adaptiffdesigns/tinymce,shilpi230/tinymce,danielpunkass/tinymce,ETSI-CTI/TinySpecMCE,ChristophKaser/tinymce,rednose-public/tinymce,ikuchmin/tinymce,gencer/tinymce,pmpl-5/tinymce,pmpl-5/tinymce,Zimbra/tinymce,widgetfactory/tinymce,adaptiffdesigns/tinymce,fillabs/TinySpecMCE,cclaerhout/tinymce,simachewh/tinymce,henrythewasp/tinymce,Kindling/tinymce,fashionsun/tinymce,collective/tinymce,danielpunkass/tinymce,aduth/tinymce,FernCreek/tinymce,fhchina/tinymce,Zimbra/tinymce,M4R7iNP/tinymce,MediehusetTek/tinymce,rbecheras/tinymce,blakewallan/tinymce,sachgits/tinymce,support-dot-com/tinymce,ChristophKaser/tinymce,rbecheras/tinymce,sjbufton/tinymce,howanghk/tinymce,gabixdev/tinymce,jashua212/tinymce,dziemian007/tinymce,jtark/tinymce,aduth/tinymce,leofeyer/tinymce,Kindling/tinymce,fashionsun/tinymce,gencer/tinymce,leofeyer/tinymce,enfold/tinymce,shilpi230/tinymce,jashua212/tinymce,rednose-public/tinymce,tinymce/tinymce,tinymce/tinymce,tinymce/tinymce,nbcp/tinymce,jtark/tinymce,gabixdev/tinymce,blakewallan/tinymce,howanghk/tinymce,fhchina/tinymce,ice8lue/tinymce,danielpunkass/tinymce,ice8lue/tinymce,sjbufton/tinymce,VioletLife/tinymce,simachewh/tinymce,kencheung/tinymce,bsuh/tinymce,toxalot/tinymce,sachgits/tinymce,ETSI-CTI/TinySpecMCE,henrythewasp/tinymce,fillabs/TinySpecMCE